An optical transmitting circuit (2) modulates multimode oscillation light using an information signal, subjects at least one oscillation-mode light beam of the multimode oscillation light to a predetermined operation, and outputting the result to an optical transmission channel. An optical receiving circuit (8) receives an optical signal transmitted through the optical transmission channel, subjects the received optical signal to an operation reverse to the predetermined operation to recover an optical signal as it was before being subjected to the predetermined operation, and converting the recovered optical signal into an electrical signal, thereby reproducing the information signal.

Multimode optical transmission device

A method includes connecting a communications device to an Internet Multimedia Subsystem network. The method includes transmitting presence information indicating multimedia capabilities of the communications device and requesting multimedia content from a multimedia server to cause the multimedia server to transmit multimedia content. The method includes detecting connection of a peripheral device to the communications device and determining that the multimedia capabilities have increased due to the connection of the peripheral device. The method includes updating the presence information to indicate the increased multimedia capabilities and transmitting the updated presence information to cause the multimedia server to transmit the multimedia content adjusted for the increased multimedia capabilities indicated in the updated presence information. The method includes receiving the multimedia content adjusted for the increased multimedia capabilities and presenting at least some of the adjusted multimedia content on the peripheral device.

Dynamically optimizing delivery of multimedia content over a network

Provided are an acousto-optic filter and an optical code division multiple access (CDMA) system using the acousto-optic filter. The acousto-optic filer includes: an acousto-optic mode converter (AOMC) converting an optical signal of a specific optical frequency corresponding to a frequency of an electric signal of an optical signal of a first mode having a predetermined optical frequency band; and a mode stripper (MS) stripping an optical signal of the optical signal of the first mode that has been converted to a second mode.

Acousto-optic filter and optical CDMA system using the same

In this paper, we propose ultra-fast multimedia optical subscriber access network using optical frequency domain CDMA method in order to access the multimedia with multiple data rates. We numerically analyze the effects of spectral power distortion in the light source for the optical CDMA system modified PN codes and FBG(Fiber Bragg Grating)s. In the proposed multiple-rate multimedia access optical networks, the performances such as BER(Bit Error Rate) are the same for all data regardless of data rates in the case of the same number of simultaneous ONU. In the proposed ultra-fast multimedia optical subscriber access network, the performances for all data are much more improved than those in the conventional system.

Proposal of Ultra-fast Multimedia Optical Subscriber Access Network to Guarantee the same Performance Regardless of Data Rates using Optical Frequency Domain CDMA Method

In this paper, we propose the ATM based Passive Optical Network (PON) using the optical CDMA scheme with optical switches and PN codes in time domain. We also propose the bipolar optical receiving correlator for PN codes. As optical CDMA is performed by driving directly an optical switch on-off switching with PN codes, the number of distinct code sequences can be increased and the flexibility in assigning PN codes can be improved. Finally we theoretically analyze the signal-to-interference -plus-noise ratio and the bit error probability of regenerated signal and compare the performance of proposed scheme compared with ATM based PON using conventional optical CDMA with optical delay lines.

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Proposal of optical subscriber access network using optical CDMA method with optical switches

In this paper, we propose optical subscriber access network to eliminate multiple access interference using 2 dimensional(D) optical frequency and time domain CDMA method. We have numerically analyzed the characteristics of proposed system. It is seen that the excess intensity noise is the major limiting factor to the system. Also it is seen that the number of simultaneous subscribers is four times as large as the conventional ID optical system under the same bit error ratio.

Proposal of optical subscriber access network to eliminate multiple access interference using 2 dimensional optical frequency and time domain CDMA method

Sang Jo Park

Papers

Acousto-optic filter and optical CDMA system using the same

Proposal of Ultra-fast Multimedia Optical Subscriber Access Network to Guarantee the same Performance Regardless of Data Rates using Optical Frequency Domain CDMA Method

Proposal of optical subscriber access network using optical CDMA method with optical switches

Proposal of optical subscriber access network to eliminate multiple access interference using 2 dimensional optical frequency and time domain CDMA method